<p>FOR IMMEDIATE RELEASE</p><p>Analyst Report Confirms Quantum's Disk And Tape Solution Offers 50 Percent Lower Total Cost Of Ownership Than All-Disk Option</p><p>Quantum Also Announces New Enhancements for PX720 Tape Library that Help Customers Realize Additional Capabilities and Value of Tiered Storage Environments</p><p>Sydney, Australia, April 20, 2005 -- Quantum Corp. (NYSE:DSS), a global leader in storage, today highlighted results from a just-completed Data Mobility Group analyst report which shows that its combined DX100 Disk-based Backup System and PX720 enterprise tape library solution costs 50 percent less to acquire and maintain over a seven-year period than an all-disk solution.In its report, the Data Mobility Group calculates the total cost of three different backup and recovery alternatives -- an all-disk solution using a commonly available Serial ATA disk system, an all-tape solution with the PX720, and a combined disk and tape solution involving the DX100 and PX720. The calculations take into account initial acquisition cost, as well as environmental and facility costs, such as power, cooling and floor space. The calculations are based on the following storage requirements and assumptions:• Initial Storage Requirement -- 50 TB• Annual Growth Rate -- 10 percent• Average Tape Cartridge Utilization -- 85 percent• Average Tape Compression -- 2:1• Average Disk Utilization -- 70 percent• Data Life -- None of the data will expire within the first seven years"With numerous government regulations requiring longer retention periods for data, many IT administrators are looking for ways to be compliant while also working within the parameters of their companies' budgets," said Dianne McAdam, senior analyst and partner for Data Mobility Group. "In order to achieve this, they are beginning to implement tiered storage architectures by assigning different categories of data to different types of storage -- using disk for quick accessibility of mission-critical data and tape for a cost-effective way to store infrequently accessed data and provide long-term archive."Customers today want to leverage the respective advantages of disk and tape and, therefore, are implementing hybrid solutions to meet their backup, recovery and archive needs. Quantum has responded with new feature enhancements in its enterprise disk- and tape-based backup systems that provide additional capabilities and protect customers' existing investments. In March, the company announced Optyon™ In-line Data Compression, the first hardware-based compression for open systems virtual tape. It enables customers to add capacity without degradation in performance while significantly lowering the immediate and long-term cost per gigabyte (GB) of disk backup.Further demonstrating the cost-effectiveness and investment protection that tape affords, Quantum is now shipping mixed media and supports LTO-3 tape technology in its PX720 tape library. The system's flexible architecture allows customers to have numerous connectivity interfaces and drive types within one library frame. As newer and faster tape drives and connectivity options become available, customers can easily upgrade to the latest technology without purchasing a new library, thus extending the life of the library and protecting their initial investment.If a customer does exceed the total capacity of a single frame, up to five PX720 tape libraries can be connected with the CrossLink™ Mechanism, providing over 1 petabyte of native storage capacity using LTO-3 tape drives. Library partitioning, the ability to consolidate and centralize the management of heterogeneous software and operating systems in one library, is another new feature that further extends the life of the library."We are finding that many of our customers are deploying a DX30 or DX100 Disk-based Backup System with the PX720 or other Quantum tape library," said Craig Tamlin, Australia and New Zealand country manager for Quantum. "Because Quantum is focused on delivering complementary disk and tape solutions, we are able to work with our channel partners to help customers implement cost-effective tiered storage architectures that meet both budgetary and regulatory requirements."To read the full report or learn more about the cost comparisons, please go to www.quantum.com/DMGTCOwhitepaper.About QuantumQuantum Corp. (NYSE:DSS), a global leader in storage, delivers highly reliable backup, recovery and archive solutions that meet demanding requirements for data integrity and availability with superior price/performance and comprehensive service and support. Quantum offers customers of all sizes an unparalleled range of solutions, from leading tape drive and media technologies, autoloaders and libraries to disk-based backup systems. Quantum is the world's largest volume supplier of both tape drives and tape automation and has pioneered the development of disk-based systems optimized for backup and recovery. Quantum Corp., 1650 Technology Drive, Suite 800, San Jose, CA 95110-1382, (408) 944-4000, www.quantum.com.###</p><p>Press Contact:Woei Chyi Lim, PR &amp; Marcoms Manager, Quantum(+ 65) 6432 2866, woeichyi.lim@quantum.com</p><p>Fiona Martin, Managing Director, Max Australia(61 2) 9954 3492, fiona.martin@maxaustralia.com.au</p><p>Quantum, the Quantum logo, DLT and DLTtape are trademarks of Quantum Corporation registered in the United States and other countries. CrossLink and Optyon are trademarks of Quantum Corporation. All other trademarks are the property of their respective owners."Safe Harbor" Statement under the U.S. Private Securities Litigation Reform Act of 1995: This press release contains "forward-looking" statements within the meaning of the Private Securities Litigation Reform Act of 1995. Specifically, without limitation, statements relating to future cost-effectiveness of tape solutions and of combined disk-based and tape solutions, are forward-looking statements within the meaning of the Safe Harbor. These statements are based on management's current expectations and are subject to certain risks and uncertainties. As a result, actual results may differ materially from the forward-looking statements contained herein. Factors that could cause actual results to differ materially from those described herein include, but are not limited to, unforeseen technological limitations, the ability of competitors to introduce new products that compete more successfully with our products and unanticipated changes in customers' needs or requirements. More detailed information about these risk factors, and additional risk factors, are set forth in Quantum's periodic filings with the Securities and Exchange Commission, including, but not limited to, those risks and uncertainties listed in the section entitled "Management's Discussion and Analysis of Financial Condition and Results of Operations -- Risk Factors," on pages 38 to 49 in Quantum's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on February 2, 2005 and pages 38 to 49 in Quantum's Annual Report on Form 10-K filed with the Securities and Exchange Commission on June 14, 2004; and those described in any subsequently filed reports. Such reports contain and identify important factors that could cause actual events and results to differ materially from those contained in our projections or forward-looking statement.Quantum expressly disclaims any obligation to update or alter its forward-looking statements, whether as a result of new information, future events or otherwise.</p>

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